71522920 has 64 divisors (see below), whose sum is σ = 185201280. Its totient is φ = 24350976.

The previous prime is 71522911. The next prime is 71522923. The reversal of 71522920 is 2922517.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (71522923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43147 + ... + 44773.

It is an arithmetic number, because the mean of its divisors is an integer number (2893770).

Almost surely, 2^71522920 is an apocalyptic number.

71522920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71522920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92600640).

71522920 is an abundant number, since it is smaller than the sum of its proper divisors (113678360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71522920 is a wasteful number, since it uses less digits than its factorization.

71522920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802 (or 1798 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 71522920 is about 8457.1224420603. The cubic root of 71522920 is about 415.0958698530.

The spelling of 71522920 in words is "seventy-one million, five hundred twenty-two thousand, nine hundred twenty".